Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a0b5e2e8ac2a868…

MALICIOUS

PDF

78.7 KB Created: 2021-09-01 09:36:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f4e6d24c3b4d7d4f99aed70380654c42 SHA-1: d34ca41c67cbe6aba4ff50c3726b197fed364219 SHA-256: 7a0b5e2e8ac2a868abcc35c49c42c1d58574f304b32daf5dee9bb3e60914d013
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript, which is a common technique for executing malicious code. The file also exhibits characteristics of a link farm, with numerous URLs pointing to potentially compromised WordPress sites, suggesting an attempt to redirect users to malicious content or phishing pages. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://divetechmarine.com/contents/files/vilulikexelidu.pdf In PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608586294dd93---76958375504.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/16080f510cb913---rowapolikagejofifakepus.pdfIn PDF document text
    • http://blow-w124.com/js/upload/files/fepakitiwete.pdfIn PDF document text
    • http://aurora-c.jp/files/files/zoruk.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607f160671b13---46550975472.pdfIn PDF document text
    • https://trellisdundee.com/wp-content/plugins/super-forms/uploads/php/files/bed6b63c5e8433a924e0490361305d99/xiwojiwogitezife.pdfIn PDF document text
    • https://makeswebsites.com/clients/c/c8/c8c605999f3d8352d7bb792cf3fdb25b/File/koposapidodomawiki.pdfIn PDF document text
    • https://acrgroup.nl/userfiles/file/25046212627.pdfIn PDF document text
    • http://influences-vegetales.eu/assets/Image/files/2947388639.pdfIn PDF document text
    • http://kpotplace.com/uploads/files/dixor.pdfIn PDF document text
    • http://www.evisiontiendaonline.com/ckfinder/userfiles/files/21708904851.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1611ac31464dc3---3030454388.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608642292dc18---fuzomixarizonivivivap.pdfIn PDF document text
    • http://centreforeffectivecoaching.com/media/file/wamiwumugumaz.pdfIn PDF document text
    • https://acgroupenterprise.com/userfiles/file/fumub.pdfIn PDF document text
    • https://digireg.it/upload/40563106486.pdfIn PDF document text
    • http://nhuaduongnhapkhauaz.org/upload/files/71853602016.pdfIn PDF document text
    • https://civilkontroll.hu/uploads/file/89641554019.pdfIn PDF document text
    • http://ltmetal.com/userfiles/files/nururaxu.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bcbde552854---patikodisoxak.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1607435cc398ad---tivufoforegimap.pdfIn PDF document text
    • https://stegopackaging.com/wp-content/plugins/super-forms/uploads/php/files/1s79d7v6b2dfactf9grbhpid06/parufezelaluparaja.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/161255cee3cbee---40684242153.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/kekuzapoxanolekoninorewu.pdfIn PDF document text
    • http://dlmberatung.ch/userfiles/files/pegezixebidixelifetukikiv.pdfIn PDF document text
    • http://kibbkw.com/uploads/file/59934277053.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=schedule+1+of+wildlife+protection+act+animalsPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cbb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBB5 17576 bytes
SHA-256: f364af1cb724f581e41f14d18e9c0185528b43d8861c9dfae699e6dc541ded35
font_01_sfnt_off0000f8a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8A4 11196 bytes
SHA-256: 79ccd90a7b767ab267329b28b39609d0774a4e02726a058132e4888a61a6b611
font_02_sfnt_off000112c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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